LM3404HVMA/NOPB-1.0A Constant Current Buck Regulator for High Power LED Drivers

The LM3404 and LM3404HV devices are monolithic switching regulators designed to deliver
constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting
applications, these devices contain a high-side N-channel MOSFET switch with a current limit of
1.5-A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an
external resistor allow the converter output voltage to adjust as needed to deliver a constant
current to series and series-parallel connected LED arrays of varying number and type. Some
features are: LED dimming using pulse width modulation (PWM), broken or open LED protection,
low-power shutdown, and thermal shutdown.